JP3136086B2 - Control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a control valve in which a four-way valve for switching the flow path of refrigerant during cooling and heating in a heat pump type refrigerant circuit and an electric valve which functions as an expansion valve are combined and integrated. In particular, by adding a bypass valve to the valve body of the four-way valve and providing a through hole in the guide bush of the transmission device, the two-way valve conventionally used for on / off control of the bypass circuit of the refrigeration cycle can be eliminated. The present invention relates to such a control valve.

[0002]

2. Description of the Related Art First, FIG.
381 shows the structure of a conventional control valve Z disclosed in Japanese Patent No. 381. The structure of the control valve Z is a six-way valve, which is roughly divided into three parts: an electric valve A, a four-way valve B, and a transmission device C that connects the electric valve A and the four-way valve B.

[0003] First, the structure of the motor-operated valve portion A is that a chamber 17 is provided at the lower end of a cylindrical case 1 made of a non-magnetic material having a large-diameter portion 1a at the upper portion, and a propulsion bearing is provided at the upper center of the chamber. 7, a valve port 8 is provided at a lower portion, and a valve body 6 having openings 18 and 19 at the side and the lower portion of the chamber is arranged.
In addition, an opening 20 below the valve port 8 in the lower part has an entrance pipe 21.
Is provided.

A stator coil 2 is provided on the outer periphery of a lower part of a case 1 and a rotor 5 of a motor integrally formed with an upper part of a screw shaft 4 having a needle valve 3 at a tip thereof.
The screw shaft 4 is converted into linear motion by a propulsion bearing 7, and the needle valve 3 is inserted into a valve port 8 at a lower portion of the valve body 6.
The opening degree of the valve port 8 is controlled by contacting and separating the ribs, and a rib-shaped convex portion 9 protrudes from the inner peripheral surface of the upper half portion of the rotor 5 at only one position in the center direction. It has been formed.

[0005] Second, the structure of the four-way valve B portion includes, as shown in FIG. 12, four openings 33, 34, 35, at the upper end of the large-diameter portion 1a at the top of the cylindrical case 1 made of a non-magnetic material.
A metal disk-shaped valve seat 37 having a concentric circle 36 and equidistant spaces is fixed, and a plastic thick disk-shaped valve body 39 is slidably mounted on the lower surface of the valve seat 37. It was done.

The four openings 33, 34, 3 of the valve seat 37
5, 36 are given angles (90, 90) as shown in FIG.
°) The openings 33 are introduced at intervals, and the openings 3 are positioned opposite to the inlets.
4 are outlets, and openings 35 and 3 arranged orthogonally to these outlets
6, an inlet pipe 40 is provided on the upper surface of the inlet 33, an outlet pipe 41 is provided on the outlet 34, and a through hole 35 is provided.
And 36 are provided with through-hole pipes 42 and 43, respectively.
Only at the lower part of 3 is a stopper 44 made of a pipe provided in a small projecting shape.

As shown in FIG. 12B, a through-hole 45 is formed at a position corresponding to the inlet 33 and the through-hole 35 of the valve seat 37, as shown in FIG. And 4
6 and a communication hole 47 (see FIG. 13A) connecting the two through holes 45 and 46 in the lower half thereof, and the outlet 34 and the through hole 36 are provided at positions corresponding to the outlet 34 and the through hole 36. An airtight communication hole 48 (see FIG. 13 (B)) for airtightly connecting the communication holes 36 is provided. The lower portions of both communication holes 47 and 48 are formed in a planar arc shape, and the communication state is cut off at each adjacent opening. It has been replaced.

As shown in FIG. 11, a hole 22 is provided at the center of the upper surface of the thick disk-shaped valve body 39, and the valve body 39 is placed in the hole 22 by the pressure of the refrigerant during operation. 37
A compression coil spring 23 having a pressure lower than the pressure applied to the valve body 39 is provided, a boss 24 is provided on the lower surface side of the valve body 39 on the opposite side, and internal teeth 25 are formed at the center thereof.

Third, as shown in FIG. 11, the transmission device C is an intermediate portion of the cylindrical case 1 made of the non-magnetic material, that is, the rotor 5 of the electric valve A and the valve of the four-way valve B. Body 29
When the valve opening 8 of the motor-operated valve A reaches the position immediately before the fully open position and the position immediately before the fully closed position, the delay transmission means 1
The rotation is transmitted to the valve body 39 of the four-way valve through the engagement means 6 and the engagement means 30.

That is, a guide bush 26 is caulked and fixed in the cylindrical case 1, and a connecting rod 28 having a flange 27 at an upper portion is air-tightly and rotatably supported at the center of the guide bush 26. External teeth 29 meshing with the internal teeth 25 at the center of the lower surface of the valve body 39 are formed at the upper end of the valve body 39, and the engagement means 30 is formed by the internal teeth 25 and the external teeth 29.

Below the connecting rod 28, a delay transmission means 16 is provided, which penetrates the guide bush 26 and has a coil having projecting pieces 14, 15 on the upper and lower sides. That is, the lower end of the connecting rod 28 extends to the inner surface of the upper half of the rotor 5 and has a flange 11 at the end.

The guide bush 26 of the connecting rod 28
A stopper 13 having a downwardly extending stopper piece 13a at its outer end is fixed slightly below the stopper 13.
11 and FIG.
6. As shown in FIG. 17, a delay transmission means 16 in which the upper and lower ends of a coil having a predetermined length are extended substantially parallel to the tangential direction as an upper projecting piece 14 and a lower projecting piece 15 is rotatably provided. The tip of the upper projecting piece 14 of the delay transmission means 16 can be brought into contact with the stopper piece 13a, and the tip of the lower projecting piece 15 is formed in an inward direction formed on the inner surface of the upper half of the rotor 5. The projection 9 can be abutted.

Subsequently, the operation (operation) of the conventional control valve will be described. As shown in FIG. 11, when the needle valve 3 of the motor-operated valve A is in the closed state, as shown in FIGS.
When the through holes 45 and 46 in the valve body 39 of the four-way valve B are in the heating state corresponding to the introduction holes 33 and the through holes 35 of the valve seat 37, as shown in FIGS. 16 and 17A. In plan view, one side surface (upper surface) of the convex portion 9 of the rotor 5 is provided on the outer surface (lower surface) of the protruding piece 15 below the delay transmission means 16, and
The outer surface (upper surface) of the upper protruding piece 14 is the stopper piece 13a.
And the upper and lower projecting pieces 14 and 15 are sandwiched between the projection 9 and the stopper piece 13a.

In this state, the valve seat 37 and the valve body 39
As shown in FIG. 14, the valve seat 37 of the four-way valve B portion
Stopper 44 protrudingly provided on the lower surface of the inlet 33
Is located at a position corresponding to the through hole 45 of the valve body 39. Therefore, as shown in FIG. 13A, the introduction port 33 and the through hole 35 are in communication with each other through the communication hole 47, and as shown in FIG. Introductory tube 40
→ The inlet 33 → the communicating hole 47 → the indoor heat exchanger E via the through-hole pipe 42, the pipe 21 of the motor-operated valve A → the valve port 8 → the pipe 19, the outdoor heat exchanger D, and FIG. As shown in B), the flow returns to the compressor F via the through-hole pipe 43 → the through-hole 36 → the airtight communication hole 48 → the outlet 34 → the outlet pipe 41.

In this heating state, when the stator coil 2 of the motor-operated valve A is energized so as to rotate in the valve closing direction, the rotor 5 of the motor shown in FIGS. As shown in FIG. 17 (B), when the projection 9 of the rotor 5 separates from the lower projecting piece 15 of the delay transmission means 16 and rotates about one turn, as shown in FIG.
5 inside (upper surface).

Subsequently, when the rotor 5 rotates, the projecting piece 15 below the delay transmission means 16 is pushed by the convex portion 9 of the rotor 5 and rotates leftward with the projecting piece 14 above.
As shown in FIG. 17C, the rotor 5 rotates until the upper protruding piece 14 comes into contact with the rear surface (upper surface) of the sper piece 13a. During approximately two rotations of the rotor 5 between FIGS. 17A to 17C, the rotation is not transmitted to the connecting rod 28 due to the idling of the coil in the delay transmission means 16. Accordingly, during this time, the opening area of the valve port 8 can be changed by the vertical movement of the needle valve 3 by the screw shaft 4, and the heating operation can be performed at the position of the optimal throttle degree.

Next, when it is desired to switch to the cooling operation, FIG.
When the rotor 5 is further rotated to the left from the state of FIG. 7 (C), the stopper piece 13a fixed integrally with the connecting rod 28 is pushed by the upper projecting piece 14, and FIG.
, The connecting rod 28 starts rotating and transmits the rotation to the valve body 36 of the upper four-way valve B portion. As a result, the valve body 39 moves 90 degrees from the state of FIG. 14 to the state of FIG.
Rotate ° and switch to cooling operation.

When switching from the heating operation to the cooling operation, the valve body 39 is rotated by 90 degrees.
The stopper 44, which has been in contact with the outer end of the inner side of the through hole 45 of the communication hole 47 in the above, comes into contact with the outer end of the inner side of the through hole 46 of the through hole 47 as shown in FIG.

The switching of the valve body 39 causes the airtight communication hole 48 to airtightly communicate between the outlet hole 34 and the communication hole 35, so that the refrigerant discharged from the discharge port of the compressor F is
The inlet pipe 40 → the inlet port 33 → the communication hole 47 → the through hole 36 → the outdoor heat exchanger D via the guide tube 43, and the control valve pipe 1
9 → Valve port 8 → Pass through the indoor heat exchanger E via pipe 21,
The flow returns to the compressor F via the through-hole pipe 42 → the through-hole 35 → the communication hole 48 → the outlet 34 → the outlet pipe 41.

In order to obtain the optimum degree of throttle in the cooling operation, that is, in the state of FIG. 17D, the stator coil 2 is energized so that the needle valve 3 rotates in the valve closing direction. Accordingly, on the principle opposite to the above, the rotor 5 of the motor makes one rotation in the right direction opposite to the arrow when viewed from above without contacting the delay transmission means, and the protrusion 9 of the rotor is Delay transmission means 16
On the opposite side of the protruding piece 15 below. Then rotor 5
Is rotated, the protruding piece 15 below the delay transmission means 16 is pushed by the protrusion 9 of the rotor sleeve and rotates rightward,
The rotor 5 rotates until the upper protruding piece 14 comes into contact with the stopper piece 13. During this time, the opening area of the valve port 8 can be changed by the up and down action of the needle valve 3 by the screw shaft 4, and the cooling operation can be performed at the position of the optimal throttle degree.

When it is desired to switch to the heating operation again, when the stator coil 2 is energized so that the needle valve 3 further rotates in the valve closing direction, the protruding piece 14 above the delay transmission means 16 contacts the stopper piece 13a. The connecting rod 28 rotates counterclockwise in FIG. 17, and the valve body 39 is moved from the state of FIG.
Is turned 90 ° to the state of and the mode is switched to the heating operation.

FIG. 10 shows the structure of a conventional two-way valve used for on / off control of a bypass circuit of a refrigeration cycle. The structure of the two-way valve G includes a valve body 101 provided with a valve seat 103 at a lower center and provided with refrigerant inflow / outflow pipes 104 and 105 at side and lower portions, respectively, and provided at an upper portion of the valve body 101. A plunger 107 made of a magnetic material having a valve body 106 at a lower end slidably inserted in a plunger tube 110 made of a non-magnetic material, and a plunger 107 above the plunger 107 via a spring 108. A suction element 109 made of a magnetic material fixed to an upper end of the plunger tube 110;
It comprises a coil 112 arranged around the plunger tube 110 and an electromagnet 111 constituted by a yoke 113 made of a U-shaped magnetic material arranged so as to surround the coil 112. In the figure, reference numeral 102 denotes a fixing screw for fixing the yoke 113 and the suction element 109.

Subsequently, the operation (actuation) of the conventional two-way valve
Will be described. When power is not supplied to the coil 112 of the electromagnet 111, the valve body 106 of the plunger 107 is pressed against the valve seat 103 by the action of the spring 108, and the two-way valve is in a closed state.

Next, when the coil 112 of the electromagnet 111 is energized, the plunger 107 is attracted by the attraction element 109 against the force of the spring 108 by the action of the magnetic field generated inside, and the valve 106 is moved from the valve seat 103. The separation causes the two-way valve to open.

FIG. 9 is a circuit diagram in which a general heat pump refrigeration cycle is provided with a bypass circuit H called a hot gas defrost type for the purpose of defrosting the outdoor heat exchanger D. In the bypass circuit H, A two-way valve G is provided between the outlet side of the compressor F and the outlet side of the indoor heat exchanger E, that is, the inlet side of the motor-operated valve portion A. In the normal heating operation, the two-way valve G is closed. With the valve in the state, the refrigerant is supplied from the compressor F to the inlet pipe 40.
→ four-way valve part B → through-hole pipe 42 → indoor heat exchanger E → electric valve part A → outdoor heat exchanger D → through-hole pipe 43 → four-way valve part B → outlet pipe 41 → circulates to compressor F Then, in the defrosting operation, the two-way valve G is opened, and the refrigerant is compressed by the compressor F, the two-way valve G, the electric valve part A, the outdoor heat exchanger D, the through-hole pipe 43, and the four-way valve part B.
The refrigerant is circulated from the outlet pipe 41 to the compressor F, and the high-temperature and high-pressure refrigerant discharged from the compressor F is directly sent to the outdoor heat exchanger D to perform defrosting.

The reason for providing such a bypass circuit H is that when the outside air temperature becomes 0 ° C. or less during the heating operation, moisture in the air condenses on the fins of the outdoor heat exchanger D and becomes frost and adheres. Therefore, the heat transfer effect of the outdoor heat exchanger D is reduced, and the efficiency (heating efficiency) of the refrigeration cycle is significantly reduced, so that defrost must be performed.

[0027]

In the prior art described above, the control valve and the two-way valve in the refrigeration cycle circuit shown in FIG. 9 are driven by independent driving devices in the specification form. There were the following problems. Space was required for installing the control valve and the two-way valve, respectively. Each electric drive means such as the stator coil 2 for the motor for operating the control valve and the electromagnet 37 for operating the two-way valve is required individually, which has increased the cost. Two controllers, one for the control valve and the other for the two-way valve, are required, and lead wires for connecting these controllers and the valve are required, resulting in high costs. The two-way valve had to be energized continuously while the valve was open, requiring an extra electricity bill.

[0028]

The control valve of the present invention comprises a motor-operated valve A which functions as an expansion valve and a four-way valve B which functions to switch the flow path of the refrigerant during cooling and heating. In the conventional control valve, a four-way valve body has a bypass valve 5
1 and a through hole in the guide bush of the transmission device, thereby adding the function of a two-way valve conventionally used for on / off control of a refrigeration cycle bypass circuit, thereby providing one drive source (fixed). It is characterized in that three functions can be controlled by the child coil 2).

That is, the control valve according to the present invention rotates the rotor 5 in the case 1 by energizing the stator coil 2 on the outer periphery of the case 1 made of a non-magnetic material.
The needle valve 3 at the tip of the screw shaft is moved up and down via a screw shaft 4 integrally provided below the center of the case 1 to control the opening degree of a valve port 8 below the valve body 6 provided at the lower end of the case 1. An electric valve A portion and a metal disk-shaped valve seat 37 having at least three openings provided concentrically are provided at the upper end of the case 1.
7 is slid and rotated on at least two of the three openings.
And the other one opening is opened by a plastic valve body 39, a four-way valve B, a rotor 5 of the motor-operated valve A, and a valve body 39 of the four-way valve B. And a transmission device C for transmitting rotation at a position immediately before the fully opened position and a position immediately before the fully closed position of the valve port 8 of the electrically operated valve A, and the rotational force of the rotor 5 of the electrically operated valve A is provided. In the control valve, the opening and closing of the valve port 8 of the motor-operated valve A and the switching of the flow path by the rotation of the valve 39 of the four-way valve B are performed in conjunction with each other. And a projection 56 is provided on the wall surface thereof so as to oppose the projection 56 to constitute a delay connection portion 55. The bypass valve 51 inserted into the opening has a delay connection portion 53 with a fan-shaped cutout in the upper half outer periphery. Similarly, the outer periphery of the lower half having the internal teeth 52 formed in the center is cut in a fan shape. Away, the valve seal part 5 further bottom
And a connecting rod 28 having a guide bush 26 of the transmission device C and an external tooth 29 provided at an upper end at a central portion thereof.
Are provided airtightly and rotatably, and a through hole 57 is provided. The delay connecting portion 53 of the bypass valve 51 and the delay connecting portion 55 of the valve body 39 connect the bypass valve 51 to the transmission device C and the valve body 39. When the delay is interlocked with a predetermined rotation angle, the space 61 of the motor-operated valve A and the space 62 of the four-way valve B are maintained until the valve element 39 rotates.
Are connected to each other.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to FIGS. Note that the same reference numerals are used for the same components as the control valve Z of the related art. As shown in FIG. 1, the control valve of the present invention has the same structure as that of the control valve of the prior art since the transmission device C and the motor-operated valve A below the external teeth 29 have the same structure as the prior art. Detailed description is omitted. Further, in the four-way valve B, the structure relating to the function of switching the flow path of the refrigerant during cooling and during heating is the same as that of the prior art, and a detailed description thereof will be omitted.

In the control valve of the present invention, the following new items are added to the four-way valve B and the transmission device C as follows. Plastic valve element 3 in part B of four-way valve
9 is provided with an inlet 33, a through hole 35, and through holes 45 and 46, and a communication hole 47 connecting the two through holes 45 and 46, and an outlet 34 and a An airtight communication hole 48 for airtightly connecting the airtight holes 36 is provided. The compression coil spring 2 is located at the center of the upper surface of the valve body 39.
3 is provided.

The valve body 39 according to the present invention has the above-described structure and, as shown in FIG. 1 and FIG.
An opening is provided on the lower surface of the lower boss 24, and a projection 56 is provided on a wall surface of the opening so as to face the boss 24, thereby forming a delay connection portion 55.

FIG. 2C shows a bypass valve 51 inserted into the opening of the valve element 39. The bypass valve 51 has a delay connection portion 53 whose upper half outer periphery is cut out in a fan shape. At the same time, the outer periphery of the lower half is similarly cut out in a fan shape. Further, the inner teeth 52 are formed in the center portion, and the bottom surface is configured as a valve seal portion 54.

The guide bush 26 of the transmission device C has a connecting rod 28 provided with external teeth 29 at its upper end at the center.
Is airtightly and rotatably provided as in the prior art, but in the present invention, in addition to this, the bypass valve 51 is additionally provided.
The through holes 57, 57 face the two fan-shaped notches in the lower half.
Is provided.

Accordingly, in the control valve of the present invention, the bypass valve 51 is connected to the transmission device C and the valve body 39 by the delay connection part 53 of the bypass valve 51 and the delay connection part 55 of the valve body 39, respectively. The space 61 of the motor-operated valve A and the space 62 of the four-way valve B communicate with each other until the valve body 39 rotates when the delay is interlocked with the rotation angle of.

Next, the operation principle of this embodiment will be described with reference to FIGS. First, in the heating operation, as shown in FIG. 5A, the positional relationship between the valve seat 37 and the valve element 39 of the four-way valve B and the open / close state of the first bypass valve 51 are determined.
The bypass valve 51 is in a closed state in a state where the inlet port 33 and the through hole 35 are communicated by 7 and the through hole 36 and the outlet hole 34 are communicated by the airtight communication hole 48.

Next, when the operation is switched from the heating operation to the cooling operation, as shown in FIG. 8A, the electric valve A which is controlled between the rotational positions (c) to (d) during the heating operation is controlled. While the rotor 5 switches to the cooling operation, the rotor 5 first advances to the position (e), as shown in FIG. 5 (B), opens the second valve body 51, and further moves to the position (f). Proceed, FIG. 5 (C)
As shown in the figure, the introduction hole 33 and the through hole 36 are communicated by the communication hole 47, and the through hole 35 and the outlet hole 3 are communicated by the airtight communication hole 48.
The four-way valve B is switched to a state where the communication with the valve 4 is established, and the cooling operation is started.

When the operation is switched from the cooling operation to the heating operation again, as shown in FIG. 8B, the electric valve A which is controlled between the rotational positions (c) to (d) during the cooling operation is controlled. The rotor 5 returns to the position (b), and as shown in FIG.
The bypass valve 51 is opened and further returned to the position (a). As shown in FIG. 5A, the inlet 33 and the through hole 35 communicate with each other through the communication hole 47, and the air hole 48 connects with the airtight communication hole 48. The four-way valve B is switched to a state in which the 36 and the outlet hole 34 are communicated with each other, and then the heating operation is started.

On the other hand, when the operation is switched from the heating operation to the defrosting operation, as shown in FIG. 8C, the motor-operated valve A which is controlled between the rotation positions (C) to (D) during the heating operation. Of the rotor 5 advances to the position (e), and as shown in FIG.
The bypass valve 51 is opened without switching the four-way valve B, and then the operation shifts to the defrosting operation. This bypass valve 51
When the valve is opened, the refrigerant flowing out of the discharge port of the compressor F is introduced into the inlet pipe 40 → the inlet port 33 → the through hole 45 → the space 61 → the through hole 51.
→ space 62 → through hole 58 → opening 18 → via pipe 19,
After passing through the outdoor heat exchanger D, as shown in FIG. 13 (B), the air returns to the compressor F via the through-hole pipe 43 → the through-hole 36 → the airtight communication hole 48 → the outlet 34 → the outlet pipe 41. During the defrosting operation, the stator coil 2 is used to keep the bypass valve 51 open.
It is clear from the principle of the conventional control valve that there is no need to energize the control valve.

When the operation is switched from the defrosting operation to the heating operation again, as shown in FIG. 8D, the rotation of the motor-operated valve A controlled at the rotational position (e) during the defrosting operation is performed. Child 5
However, returning to the position (b), as shown in FIG. 6A, the bypass valve 51 is returned to the closed state without switching the four-way valve B, and then the heating operation is started.

As described above, the control valve of the present invention, as shown in FIG. 7, has a function of restricting the valve port 8 of the motor-operated valve A by changing the rotational position of the rotor 5 of the motor-operated valve A, thereby providing a four-way operation. Valve B
The three functions of the switching function of the second valve element 51 corresponding to the function of the cooling / heating switching of the valve element 39 of the section and the function of the two-way valve G can be controlled. Further, the total number of steps of the rotor 5 and the value of the delay angle of the delay connection portion are not limited to those described in the related art and the present invention, and can be freely designed in consideration of the use application and cost. is there.

[0042]

As described above, the control valve according to the present invention comprises a motor-operated valve A which functions as an expansion valve and a four-way valve B which functions to switch the flow path of the refrigerant during cooling and heating. In the conventional control valve consisting of a part, a bypass valve 51 that operates delayed is newly provided in the valve body of the four-way valve, and the outer peripheral surface of the bypass valve 51 is notched in a fan shape, and a valve seal part 54 is formed at the bottom part, By providing a through hole in the guide bush 26 of the transmission device C so as to face the fan-shaped notch, the function of a two-way valve conventionally used for on / off control of the bypass circuit of the refrigeration cycle is added. Therefore, one drive source (stator coil 2) is used to
One function can be controlled by one control valve.

Accordingly, since the electromagnet and most of the valve body in the two-way valve are not required, the device is very compact (space saving). Since the electromagnet and most parts of the valve body in the two-way valve are not required, the manufacturing cost is reduced. Since the controller and the lead wire in the two-way valve are not required, the manufacturing cost is reduced. Since the two-way valve function is interlocked with the motor of the electrically operated valve A having the self-holding function, it is not necessary to energize the valve while the valve is open, and the electricity bill is unnecessary. There is such an effect.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a control valve of the present invention.

FIG. 2 is an exploded perspective view of a valve seat, a valve body and a bypass valve of the control valve of the present invention, wherein (A) is a perspective view of the valve seat, (B) is a perspective view of the valve body, and (C) is a perspective view of the valve body. The perspective view of a 2 valve body, (D) is a perspective view of a guide bush.

FIGS. 3A and 3B are enlarged perspective views of a bypass valve of the control valve of the present invention, wherein FIG. 3A shows a state viewed from the delay connection portion side, and FIG.

FIG. 4 is an enlarged perspective view of a valve body of the control valve according to the present invention, which is a perspective view as viewed from a delay connection portion side.

FIG. 5 is a plan view for explaining the operation state of the delay connection portion of the control valve and the opening / closing state of the bypass valve at the time of cooling / heating switching, and FIG.
(B) is during cooling operation switching, (C) is during cooling operation,
(D) shows a state during the switching of the heating operation.

FIG. 6 is a plan view for explaining the operation state of the delay connection portion of the control valve and the opening / closing state of the bypass valve during switching between heating and defrosting according to the present invention;
(B) shows the state at the time of the defrosting operation.

FIG. 7 is a graph chart showing a relationship among a rotation position of a rotor, a valve opening flow rate of a motor-operated valve, a valve body position of a four-way valve, and an open / close state of a bypass valve.

FIG. 8 is a graph chart showing a relationship between a rotation position of a rotor, a valve body position of a four-way valve, and an open / closed valve state of a bypass valve at the time of each operation mode switching, where (A) is a heating operation → a cooling operation; (B) shows the state at the time of switching from the cooling operation to the heating operation, (C) the heating operation → the defrosting operation, and (D) shows the state at the time of switching from the defrosting operation to the heating operation.

FIG. 9 is a refrigeration cycle diagram using a control valve and a two-way valve according to the related art, in which a solid arrow indicates a refrigerant flow during a heating operation, and a broken arrow indicates a refrigerant flow during a defrost operation in the bypass circuit H. Is shown.

FIG. 10 is a longitudinal sectional view of a conventional two-way valve in a closed state.

FIG. 11 is a longitudinal sectional view of a conventional control valve in a heating state.

FIG. 12 is an exploded perspective view of a valve seat and a valve body of a conventional control valve, where (A) is a perspective view of the valve seat, and (B) is a perspective view of the valve body.

13 is a cross-sectional view showing a state where a valve seat and a valve body of a conventional control valve are combined, and FIG.
Sectional drawing, (B) is BB sectional drawing of FIG.

FIG. 14 is a plan view showing a positional relationship between a valve seat and a valve body during heating of a conventional control valve.

FIG. 15 is a plan view showing a positional relationship between a valve seat and a valve body during cooling of a control valve according to the related art.

FIG. 16 is a partially cutaway perspective view of a delay connection means of a control valve according to the related art.

FIG. 17 is a plan view for explaining the operation state of the delay connection means of the control valve of the related art at the time of switching between cooling and warming, where (A) is for heating, and (B) to (C) are valve openings. At aperture,
(D) is a top view which shows the state at the time of heating.

[Explanation of symbols]

A Motorized valve B Four-way valve C
Transmission device D Outdoor heat exchanger E Indoor heat exchanger F
Compressor G Two-way valve H Bypass circuit Z
Control valve 1 Case 2 Stator coil 3
Needle valve 4 Screw shaft 5 Rotor 6
Valve body 7 Propulsion bearing 8 Valve port 9
Convex part 10 Lid 11 Flange part 13a Stopper piece 13 Stopper 1
4 Upper projecting piece 15 Lower projecting piece 16 Delay transmission means 1
7 chamber 18 opening 19 pipe 2
0 opening 21 pipe 22 hole 2
3 Compression coil spring 24 Boss 25 Internal teeth 2
6 Guide bush 27 Flange 28 Connecting rod 2
9 External teeth 30 Engagement means 31 Valve body 3
2 Cylindrical case 33 Opening (inlet) 34 Opening (outlet) 3
5 Opening (through hole) 36 Opening (through hole) 37 Valve seat 3
8 compression coil spring 39 valve element 40 introduction pipe 4
DESCRIPTION OF SYMBOLS 1 Lead-out pipe 42 Through-hole pipe 43 Through-hole pipe 4
4 Valve body stopper 45 Through hole 46 Through hole 4
7 Communication hole 48 Communication hole 51 Bypass valve 5
2 Internal teeth 53 Delay connection part 54 Valve seal part 5
5 Delay connection part 56 Projection 57 Through hole 5
8 through hole 59 through hole 60 engaging means 6
1,62 space 101 valve body 102 set screw 1
03 Valve seat 104 Inflow / outflow pipe 105 Inflow / outflow pipe 1
06 Valve element 107 Plunger 108 Spring 1
09 Suction element 110 Plunger tube 1
11 electromagnet 112 coil 113 yoke

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/04 F16K 11/074 F25B 41/04

Claims (1)

(57) [Claims] 1. A screw shaft integrally provided below the center of the rotor 5 by rotation of the rotor 5 in the case 1 by energizing the stator coil 2 on the outer peripheral portion of the case 1 made of a non-magnetic material. A needle valve 3 at the tip of a screw shaft is moved up and down via a valve 4 to control an opening degree of a valve port 8 at a lower portion of a valve body 6 provided at a lower end of the case 1, and at least three openings are concentric. A metal disk-shaped valve seat 37 provided above is provided at the upper end of the case 1, and the lower surface of the valve seat 37 is slid and rotated so that at least two of the three openings are air-tightly connected. One opening is a four-way valve B portion including a valve body 39 that is opened, and a motor-operated valve A portion provided between the rotor 5 of the motor-operated valve A portion and the valve body 39 of the four-way valve B portion. The valve port 8 is constituted by a transmission device C for transmitting rotation at a position immediately before full opening and a position immediately before full closing, Control that utilizes the rotational force of the rotor 5 of the motor-operated valve A to interlock the opening and closing of the throttle port 8 of the motor-operated valve A and the flow path switching by rotation of the valve body 39 of the four-way valve B. In the valve, the lower surface of the boss 24 below the valve body 39 is opened, and a projection 56 is provided on the wall surface thereof so as to be opposed to form a delay connection portion 55. The bypass valve 51 inserted into the opening has an upper half thereof. The outer periphery is notched in a fan shape, and a delay connection portion 53 is provided. In the same manner, the outer periphery of the lower half portion in which the internal teeth 52 are formed is also notched in a fan shape, and a valve seal portion 54 is formed on the bottom surface. The guide bush 26 of the transmission device C is provided with a connecting rod 28 having an external tooth 29 at the upper end at the center thereof in an airtight and rotatable manner, and a through hole 57 is provided. By the connecting portion 53 and the delay connecting portion 55 of the valve body 39, When the valve 51 is interlocked with the transmission device C and the valve body 39 at a predetermined rotation angle, the space 61 of the electric valve A and the space between the four-way valve B are maintained until the valve body 39 rotates. A control valve, wherein the space 62 communicates.